Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_terminator_challenge_winners.thumb.jpg.6becf44442bc7105be59da91b2bee295.jpg

Sign in to follow this  
GTom

3.5mm Delos vs Vixen HR 2.5mm for planets?

Recommended Posts

I have to admit I am lagging behind following the advancement in eyepiece-tech. Which would you prefer for planetary work with a 105/735 APO refractor and a c5?

Delos 3.5mm or Vixen hr 2.5mm, or something else? The Delos would already yield a 200+magnification, I don't think it's too much use to stretch it further. 

 

Did anyone has/had a chance to compare these two?

Share this post


Link to post
Share on other sites

X210 with the delos 3.5 would be good on a steady night, but the 2.4mm Vixen HR giving X306 would give you a significant boost in image scale which would be great for lunar in particular. It may need an exceptional night to see any advantage in planetary performance in your 105 Apo. Though I've not yet used either eyepiece, i regularly use a superlative 3.5mm XW on my own refractor and its a great focal length eyepiece. I've also had terrific views of the moon and Venus at X474 while using a Vixen 2.5mm LV and a Tak extender Q, so can say with certainty that the 2.4 HR on your refractor is not asking too much from your scope due to the scopes sharp optics. You may find both eyepieces to be pushing it on your C5.

Mike

Share this post


Link to post
Share on other sites

I'd probably want both focal lengths in my eyepiece case to be honest, though the 3.5 Delos would get used more often.

I have a 3.5 Pentax XW that gets plenty of use in my Tak 100 F/9 and sometimes the Nagler 2-4mm zoom gets in the action if I'm trying to tease apart really close doubles.

With the C5 though I think the 3.5mm would be quite a lot more than is useful. So you are buying for your refractor here rather than for the SCT I feel.

Share this post


Link to post
Share on other sites

Hello. I to have a Pentax 3.5xw and a very good eyepiece it is to(70d field of view with sharp Ortho type of great optical quality and 20mm eye relief) . This eyepiece I use for splitting stars mostly and lunar('had some very sharp high power views of the lunar craters with this eyepiece) in my refractor with good seeing conditions. probably in theory the most powerful eyepiece that I should think about buying. But I  have also  been interested in the vixen 2.5 HR to which initially I had great concerns if this eyepiece of such a power would produce worth while views. But if I remember correctly a chap called Bill paolini (I am not sure I have spelt the gents name correctly) did a test/review of the vixen HR and if I remember correctly he got extremely sharp crisp views through it using a sensible size quality refractor. And if I remember correctly he compared it to, and ranked it in the same sort of league as the legendary ZAO to which to me is extremely high praise indeed. So I would think this would be an excellent eyepiece to use for very high power use using a refractor when seeing conditions allow   

So to answer your question IMO you will probably get more use out of a 3.5mm , but when the rare seeing conditions allow the vixen HR from what I have read will provide extremely sharp high power views. The refractor will be able to be used with both. I suspect to much for the c5

Hope the above is of some help☺

Share this post


Link to post
Share on other sites

I've just landed a 2.5mm SLV second hand and a 3.5mm Delos and 4.5mm Delos are the last two eyepieces on my list to track down.

I had a brief go with the 2.5mm SLV in my 120mm f5 refractor last night - the SLV gives a 0.5mm exit pupil and 240x which is as far as the scope should go in theory. The image was very good clarity-wise, better than I was expecting but last night was relatively good seeing and I wonder if it was good luck that the conditions allowed it. The dimmer image from the higher magnification is noticeable and there's certainly no need for a moon filter.

The other thing the SLV threw up was that 240x is a lot of magnification for an AZ3 mount to handle!! Tracking manually with an alt/az was more work than I'm used to and time to settle down from vibrations after focusing etc was noticeable when it is't something I notice at lower magnifications. I need to give it a go mounted on the EQ5 - I think that will solve tracking and vibes.

I don't have anything of a similar focal length to directly compare it to but all things considered it seems good - I also need to give it a go in a smaller 70mm travel scope where it will provide a useful 160x.

Share this post


Link to post
Share on other sites

Thanks for all the replies! One more candidate enters the scene: Barlow + Delos 3.5, for those nights with extraordinary seeing. Honestly I am reluctant to buy two eyepieces for planetary but a good Barlow could be used all around. 

 

And yes, i am more buying this eyepice for my refractor, especially that a second one, a 90/600 triplet is on the way, that's going to br my travel scope.

Edited by GTom

Share this post


Link to post
Share on other sites
On 12/11/2016 at 00:24, GTom said:

Thanks for all the replies! One more candidate enters the scene: Barlow + Delos 3.5, for those nights with extraordinary seeing. Honestly I am reluctant to buy two eyepieces for planetary but a good Barlow could be used all around. 

 

And yes, i am more buying this eyepice for my refractor, especially that a second one, a 90/600 triplet is on the way, that's going to br my travel scope.

If you do consider that route I'd recommend a Powermate, Tele Extender or Focal Extender rather than a barlow. The Delos already has 20mm of eye relief and the barlow will extend that further which canl make eye placement rather difficult. The 3 former devices either remove or much reduce this effect.

 

Edited by John

Share this post


Link to post
Share on other sites
9 hours ago, John said:

If you do consider that route I'd recommend a Powermate, Tele Extender or Focal Extender rather than a barlow. The Delos already has 20mm of eye relief and the barlow will extend that further which canl make eye placement rather difficult. The 3 former devices either remove or much reduce this effect.

 

Good point! I'll see that first hand, because I have an old Zeiss Barlow in stock which is worth of a replacement.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Ardrid
      Hi everyone,
      I was lucky enough to get a 12" Skywatcher Dobsonian (305mm/1500mm) for Christmas. It shipped with a 10mm Plossl and a 25mm Plossl, both 52° AFOV. Finally had a clear enough night to try it out and I absolutely loved it. I researched a bunch over the last year so I knew this was the scope I wanted should someone want to get me a really sweet gift before I grabbed it myself. What I didn't research at the time was accessories and equipment, something I've been doing relentlessly over the past few days.
      I'll primarily be viewing in the backyard until I find a great viewing spot (and a good way to safely transport). Light pollution isn't terrible but I haven't fully gauged its impact on seeing fainter objects. I'm not interested in imagery/photography at the moment. Not foreclosing on the idea by any means but everything I'm looking to add is purely for visual gratification at this point. Hoping the experts out there can lead me in the right direction. Here's what I'm trying to figure out:
       
      1. What eyepieces should I pick up?
      I've read that, generally speaking, you want 2-3 premium pieces in over to cover low, medium, and high magnification. I'm currently looking at the following "sets": 5mm Nagler, 13mm Ethos, 35mm Panoptic or 6mm Ethos, 13mm Ethos, 21mm Ethos. I'm not overly concerned about price. I recognize that there's going to be a premium associated with a brand like TeleVue and with squeezing out that last drop of performance; however, I don't want to throw away money unnecessarily if I'm not going to see a benefit from pulling out the stops. I'm not beholden to TV by any stretch but everyone says they're the gold standard so I figured I'd look there first. I'm not looking to grab everything at once either. Was thinking of starting with the 13mm Ethos since it would fill the mid-range gap between my 10mm and 25mm. 
      2. Should I grab a Paracorr?
      I've read many comments that go back and forth on this but the consensus seems to be that, while it's not crucial at f/4.9 like it would be with a faster scope, it's something I should probably have in the arsenal if I'm using wide field eyepieces, which the ones I'm contemplating are. I couldn't detect any coma with the two eyepieces I currently have but I suspect I probably wouldn't given the FOV and my beginner status. I also think that once I see it I'm not going to be able to unsee it. 
      3. Should I pick up a Barlow?
      This question assumes I'm not getting a Paracorr. I like the idea of essentially doubling the number of eyepieces I have but I'm not too sure of the ultimate utility/necessity of it.
      4. Any other crucial accessories I should have?
      I'm looking at a Cheshire collimator for when the time comes. Aside from that, is there anything else I should absolutely have?
      5. Finally, any suggestions on transporting?
      It goes without saying but this baby is heavy. I don't have a garage, and I'm hesitant to store it in the shed, so what I've been doing is removing the OTA from the base and transporting them separately to the backyard for setup. It's not bad but I can see it getting old after awhile, especially with numerous viewing sessions in a row. After all, I didn't get this scope so it could collect dust; I want to use it as often as the weather lets me. I do plan on replacing the feet with wheels so I can at least roll it, but I'm trying to figure out a good solution to getting it in and out of the house (down 3 small steps) to the backyard without damaging it or breaking my back. 
      I think that's all I have for now. I appreciate any help you all can provide. I'm just trying to learn as much as I can so I can have a great experience and eventually show my little guy all about the joys of astronomy. Thanks everyone!
    • By Uplooker
      Tele Vue 8mm Radian in excellent condition. No marks on optics or barrel. Comes with both end caps, original box, instructions, pupil guide and Tele Vue sticker.
      The “Instadjust” eyeguard housing works smoothly and holds firm.
      Only selling to UK buyers.
      Selling for £110, including Royal Mail Special Delivery.
      I will accept payment via PayPal as gift or buyer pays fees or bank transfer.
      Happy to provide more photos on request. 
      Selling as I am just not using it and to fund further purchases.




    • By 25585
      Mint, only taken out of box. Bought from Telescope House a few months ago. Paracorr 2 setting H
      £399 including Royal Mail next day, signed, tracked. Bank xfer or Paypal friends.
      Photos following....
    • By 25585
      I use the TV Panoramic mount with my Genesis. Bought both together & they are excellent grab & go. 
      So as my Skytee 2 is too heavy for tucking under an arm & I like scope in or on top mounts, I am considering a fork mount for my fracs, of which the 120 Equinox is bulkiest and heaviest. 
      The only maker I can find for fork mounts for scopes (others for binoculars) is Tele Vue, & their Gibraltar 5. They seem to come with a star finder gadget which may be good being for TV. 
      So does anyone here use a TV Gibraltar for any size of scope, & can advise on its pros & cons including the star finder?
    • By alanjgreen
      Televue Delos 10mm For Sale
      The eyepiece is one of a pair of 10mm that I used for binoviewing (I sold the other earlier this week!). It is in excellent condition and comes complete with original Televue box and end caps.
       
      NOW SOLD
       
       
       
       

       
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.